What does the word hairpin mean?

Usage examples for hairpin

  1. My dear, if this train really stops there, there must be the very deuce of a hairpin corner coming, or else we're on the Inner Circle. – The Brother of Daphne by Dornford Yates
  2. I remembered how, more than once, I had picked up and restored to Anne a hairpin that had fallen from her glorious hair. – The Red Symbol by John Ironside
  3. The thief had not even had the grace to use a hairpin, but had calmly bent back the opening slit. – The Rosie World by Parker Fillmore
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